Hello @Ralph_Stroud and welcome to the forum 
That seems to be the case here too.
Some time ago, @NabilMaghfurUsman made the 2-Point Perspective assistant so they may be interested in your topic and may (or may not) reply about this.
Here is the topic where they introduced it:
Call for Testing: 2-Point Perspective Assistant
I believe that @tiar is involved with Painting Assistants and may be able to offer comment.
Krita can have off-canvas content and the layers are infinite in extent but you can only see that part of the layer the canvas is over. The Move Tool, as an example, detects and operates on off-canvas content.
Off-canvas content is used for sliding background content and other types of content in animations.
Your method of Resizing the canvas to create what will eventually become off-canvas content is a valid and useful method.
There have been thoughts about making off-canvas content visible in some way but it’s apparently a very difficult thing to do.